With a slim design that is extremely light, this helmet offers the ventilation you need when you are hitting the trails. Durable, In-mold polycarbonate shell with EPS Liner. Roc Loc (R) 5 fit system featuring a two-way fit adjustment. Slim design is light. Exceptional ventilation, 21 vents. Available in three Super Fit(TM) sizes so that you can get a helmet that is custom for your needs. Imported.